Source:
International Association of Jewish Genealogical Societies and JewishGen

Jewish genealogical societies are organizations of persons who are
tracing their family histories. These societies typically meet once a
month from September to June. At these meetings, members help each
other solve problems in documenting their ancestors. Because the
Holocaust has had such a profound affect on contemporary Jewish
families, many members of these societies have expertise in Holocaust
research.

Genealogical special interest groups (SIGs) are organized by geographic
area of ancestry. Members are located throughout the world;
consequently, regular meetings are not held, and the principal method
of communication is their publications or the Internet. Members of
these SIGs have expertise in Holocaust research for the particular
region.